Carrier 38AC - Manual (Page 5)

Table 2 — Electrical Data (3-Ph, 60-Hz)
UNIT
MODEL
^■ 430
550
640
430
540
640
38AC
012
38AC
016
VOLTS NDSV
208
230
460
208'
WSAÍ ICF
208 172 6
220^240165 5
440-480;^30 9
208 ”|90’^'
230 1220-230181 7
460 440-480)39 0
197 ó
178 6
89.5
273 'S
249 8
125 7
FU
s'?
75
35
100
90
45
COMPR_
FLA LRÁ
50 C
45 0
22.2
64 C
58 0
29.0
191
172
86
266'
240
12 c
FANS*
FLA,fe£)
3 2
3.2
1.6
3 2
3 2
1 6
FLA — Full Load Amps
FU — Fuse (max allowable amps; dual element)
ICF — Maximum Instantaneous Current Flow (during start-up:
sum of LRA for compressor plus FLA for all other motors
in the unit)
— Locked Rotor Amps
— Nominal Distribution System Voltage (Application Range)
Motors and controls will operate satisfactorily 10 percent
above and 10 percent below NDSV
— Wire Sizing Amps per NEC Tables 310-12 thru 310-15
Values are sums of 125 percent of FLA of compressor plus
F LA of all other motors in the unit
*Unit 38AC012 has two; Unit 38AC016 has three
LRA
NDSV
WSA
TROUBLESHOOTING GUIDE
HEATING AND COOLING CYCLE
Compressor Will Not Run (Contactor Open)
Power off — restore power.
Transformer defective — replace transformer.
Thermostat defective — clean or replace ther­
mostat.
Control relay defective — clean contacts or
replace coil.
Compressor contactor defective -- clean con­
tacts or replace coil.
Holding relay defective — clean contacts or
replace coil.
Timer motor or switch defective — replace
timer.
Electrical connections loose — check and
tighten all electrical connections
Pressurestat open — check setting or replace if
defective.
Reversing valve relay defective — replace relay.
Compressor Will Not Run (Contactor Closed)
Disconnect switch open or fuse(s) blown —
restore power or replace fuses.
Compressor leads loose — tighten connections.
Compressor motor windings open ^ replace
compressor motor.
Compressor seized — check compressor
bearings.
Compressor Cycles on Protective Device
Compressor is hot — replace broken valves or
head gaskets. Check reversing valve positioning.
Overload defective — replace overload.
Line voltage outside allowable limits or 3-phase
imbalance — request assistance from power
company.
High load condition — check system charge
andjor purge noncondensables.
Compressor Cycles on High Pressure Switch
Refrigerant overcharge — purge until charge is
correct. See charging chart
Noncondensables in system — purge and
recharge.
Discharge line restricted — remove restriction.
Reversing valve damaged — replace or repair
reversing valve.
Fan cycling on overload — check fan motor
capacitor, fan motor compressor leads or fan
relay.
Filter or coils dirty — clean or replace filter.
Clean coils.
HEATING CYCLE (INSUFFICIENT HEATING)
Compressor Runs (Low Suction and Low Head
Pressure; Outdoor Fan Stopped)
Defrost relay defective — replace relay.
Outdoor fan motor leads loose — tighten motor
connections
Fan motor protection open — replace motor.
Fan motor burned out — replace motor.